Re: problems with sysroot variable when cross compiling uprobes

[Torsten Polle <Torsten dot Polle at gmx dot de>]

Dear all,

my original mail was classified as spam. As a different mail got accepted, I hope the problems are fixed now.

> Am 02.03.2016 um 10:38 schrieb Holger Brunck <holger.brunck@keymile.com>:
> 
> Hi Torsten,
> 
> On 03/01/2016 08:59 PM, Torsten Polle wrote:
>>> I am working on a powerpc board with 32 bit architecture and try to
>>> compile userspace probes. This means I have my own cross compiled
>>> root filesystem and I am using stap then with the --sysroot option.
>> 
>>> I had a setup up and running with systemtap version 2.5 for a longer
>>> time. Now I tried to upgrade my sytemtap version to 2.9. But already
>>> with version 2.6 I see the following problem: When I try to compile
>>> my stap probe it complains with an error message that the executable
>>> can not be found. And what I see that the path I specified for my
>>> sysroot variable is duplicated.
>> 
>> [...]
>> 
>>> As I said it works fine with an own build systemtap 2.5 but does not
>>> work with an own build systemtap 2.9. Also the official installed
>>> stap version 2.8 on my host system shows the same error.
>> 
>>> Am I am doing something wrong here or has anybody seen the same
>>> problem? Any help is appreciated.
>> 
>> I'm using a cross compile environment for ARM. For me everything works
>> fine. But I'm using a number of patches to make everything in my
> 
> great, the third patch definitely solves the problem I have on my side and I can
> use systemtap 2.9 in my powerpc environment. Thanks a lot.
> 
>> environment. I never dared to upstream those because my knowledge of the
>> SystemTap code itself is very poor and might be wrong for the general
>> case. If they also work fine for you, the patches might be a starting
> 
> I am also not familar with the code. But it might be worth to try to upstream
> it. Even if it might be not a perfect solutions for the general case, others
> around may then propose clean solutions which are ready to be merged upstream. I
> mean the sysroot option seems to be broken. Or is anyone around here who can
> work with the upstream version in a cross compiled environment and uses this
> option successfully?
> 
> Best regards
> Holger Brunck

Enclosed are four patches I use to be able to use SystemTap in a cross compile environment. As my knowledge about the internals of SystemTap are limited, they might be a bit rough. Any comments to improve them are welcome.

Kind Regards,
Torsten

Attachment: 0001-Support-the-sysroot-option-for-modules-added-for-sym.patch
Description: Binary data

Attachment: 0002-Fix-Debug-links-are-not-found-if-the-sysroot-is-used.patch
Description: Binary data

Attachment: 0003-Fix-Processes-are-not-found.patch
Description: Binary data

Attachment: 0004-Fix-process.library.function-failed-with-sysroot.patch
Description: Binary data